21003044001 has 8 divisors (see below), whose sum is σ = 28093529760. Its totient is φ = 13957293792.

The previous prime is 21003043981. The next prime is 21003044003. The reversal of 21003044001 is 10044030012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21003044001 - 2⁹ = 21003043489 is a prime.

It is a super-2 number, since 2×21003044001² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21003044003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11182791 + ... + 11184668.

It is an arithmetic number, because the mean of its divisors is an integer number (3511691220).

Almost surely, 2^21003044001 is an apocalyptic number.

It is an amenable number.

21003044001 is a deficient number, since it is larger than the sum of its proper divisors (7090485759).

21003044001 is a wasteful number, since it uses less digits than its factorization.

21003044001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22367775.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21003044001 its reverse (10044030012), we get a palindrome (31047074013).

The spelling of 21003044001 in words is "twenty-one billion, three million, forty-four thousand, one".